Whisk flour, sugar, baking powder and salt.,Cut in butter until in fine crumbs.,______,Turn out onto a floured surface; knead gently for 30 seconds.,Roll or pat into an eight inch square; spread with butter.,Mix the orange sugar and sprinkle over dough.,Roll up jelly roll fashion; cut into eight slices.,Place, side by side and cut side down, in a greased 9 or 10 inch tube pan.,Bake in centre of a 425 oven for 35 minutes or until golden.